Ventilated tuyere



July 5, 1938.

W* A. RIDDELL VENTILATED TUYERE Filed May 18, 1936 2 Sheets-Sheet l wwa w gill, lIl

INVENTOR.

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, ATTORNEY July 5, 193s. W A. RlDDELL 2,122,951

VENTILATED'TUYRE Filed May 18, 1936 2 Sheets-Sheet 2 Eej 5 INVENTOR. 9L, www,

ATTORNEY Patented July 5, 1938 UNlTED STATES PATENT OFFICE VENTILATED TUYRE Application May 18, 1936, Serial No.80,444

p 8 Claims.

My invention relates broadly to furnaces and more particularly to an improved construction of Ventilated tuyre for furnaces.

One of the objects of my invention is to provide v a construction of ventilated tuyre for furnaces having means for reducing the tendency of the tuyre to be burned out under conditions of high temperature furnace operation.

Another object of my invention is to provide 16J a construction of tuyre having means for uniformly distributing air beneath the fire bed while eliminating the tendency of blowing holes in the lire bed. Still another object of my invention is to prof vide a construction of tuyre formed from a casting having a relatively thin wall shaped to distribute air under pressure radially from a substantially central'position beneath the plate and in a relatively narrow connecl zone extending in Y a plane beneath the plate substantially parallel with the plane of the plate.

, A further object of my invention is to provide aconstructicn of tuyre having passages therethrough for the recirculation of air currents tending to maintain the tuyre at a safe operating temperature and independently of the distributing means for delivering air under pressure beneath the re bed.

Another object of my invention is to provide a construction of tuyre having elongated slotted self-clearing air passages therein.

A still further object of my invention is to provide a construction of ventilated tuyre having a multiplicity of radially extending deflecting members immediately beneath the tuyre plate for directing air beneath the re bed in a prenatterned Zone extending in a plane substantially parallel with the plane of the tuyre.

Otherand further objects of my invention reside in an improved construction of cast tuyre as set -forth more fullyin the specication hereinafter following by reference to the accompanying drawings, in which: v

- Figure 1 is a plan view showing a group of tuyres constructed in accordance with my invention andv assembled in operating relation;

Fig. 2'is a longitudinal sectional view taken on line 2--2 of Fig. l and illustrating the superimposed relation of the group of tuyre plates shown therein; Fig. 3 is a front end view of the group of tuyres illustrated in Figs. 1 and 2; Fig. 4 is a bottom plan view of the tuyre plate of my invention; Fig. 5 is an end elevational view of the tuyre plate shown in Fig. 4; and Fig. 6

is a longitudinal view through the tuyre plate taken on line 6-6 of Fig. 4.

Referring to the drawings in detail, reference character I indicates a tuyre plate embodying my invention. Thev tuyre plate I is illustrated in assembled superimposed relation with respect to three similarly formed tuyre plates. For purposes of interlocking the tuyre plates, each tuyre plate is provided with a centrally positioned substantially rectangular aperture 2 provided l0 with a shoulder 3 adjacent the forward end thereof. Each tuyre plate is provided with a depending member 4 connected therewith having a hook-shaped end portion 5 thereon directed toward the front of the tuyre plate. A strengthl5 ening web 6 is provided immediately behind the depending member 4 and extending to the shoulder 3 of the tuyre plate. The lower surface of the tuyre plate I immediately adjacent the central aperture 2 is tapered upwardly and terrni- 20 nates in a substantially thinner rearwardly projecting portion of the tuyre plate as shown. The rearwardly projecting portion of the tuyre plate I terminates in an inwardly curved edge indicated at 8. The rearwardly projecting portion 25 of the tuyre plate I is symmetrically apertured at 9. In the foregoing description and hereinafter, I refer to the front of the tuyre plates as that portion which is exposed and seen when viewing an assembled grate, namely the portion 30 terminating at the edge I8.

For purposes of insuring the recirculation of air through the tuyre plates and the maintenance of the tuyre plates at relatively safe operating temperatures, I provide substantially seg- 35 mental shaped or curved slots l0 in the plate I.

The slots I0 are separated at the central longitudinal axis of the plate by a strengthening web portion of the plate. The slots I0 are curved to substantially conform in shape to the perimeter 40 of the tuyre plate I indicated generally at I 6 from which the tuyre plate is inclined to a terminating curved edge shown at I8 along an inclined surface which I have indicated at I'I. The tuyre plate I is relatively thin and is supported 45 by a pair of depending side Walls of substantially the same thickness as indicated at I2. The depending walls I2 each contain passages I3 ex- -ribs I9 immediately beneath the tuyre plate I.

The ribs I 9 are each formed on an angle as represented at 2U and are rounded to offer minimum obstruction to the passage of air while guiding 55 theair over a fan-shaped area in a confined Zone immediately beneath the tuyre plate. For purposes of additionally cooling the tuyre plate, I provide apertures 2l in the horizontal portion of the tuyre plate and between the sets of deflecting plates or supporting ribs I9. The apertures 2l are so positioned that air is directed upwardly immediately'against the lower surface of the inclined plane portion I1 of the tuyre plate immediately above. The inclined portion I'I of the tuyre plate is Idirected toward the horizontal portion of the lower adjacent tuyre plate providing a confined zone 22 for the .passage of air. That is to say, a narrow zone is provided for the distribution of air in a plane substantially parallel with the plane of the tuyre plate. The exit for air beneath the tuyre plate is narrow in cross-sectional area immediately above an adjacent lower tuyre plate through which air is adapted to be forced ina blast directed against the lower surface of the inclined portion I'I of the tuyre plate immediately above the apertured tuyre plate. The radial position of ribs I9 is such that air is distributed ina fan-like direction from the tuyre plate. A pair of ribs I9 extend adjacent each other on opposite sides of the center line of the tuyre plate and are symmetrically distributed beneath the tuyre plate as shown more particularly in Fig. 4. The ribs I9 are spacially related to form substantially rectangular channels beneath the tuyre plate. The channels established between the ribs I9 are proportioned so that the transverse dimension thereof is not less than twice the thickness of the adjacent ribs I9.

'The tuyre plates are readily superimposed with respect to each other as illustrated in Figs. 1, 2 and 3 and may be individually replaced as required. In order to explain the superimposed relation of the plates, I have shown the similarly formed plates as identified by similarly numbered reference characters having the subscripts a, b and c applied thereto, that is to say, the tuyre plate immediately below the tuyre plate which has been described in detail terminates in a peripheral edge portion indicated at IBa. 'I'he next adjacent lower tuyre plate terminates in a peripheral edge Ib. The tuyre plate beneath the last mentioned peripheral edge is indicated at Ic. As represented in Fig. 3, the ribs of the severaltuyre plates I, Ia, Ib and Ic are aligned with each other so that air is distributed in zones substantially parallel with the planes of the respective plates. The relatively thin construction of the tuyre plates serves to reduce cost in manufacture and facilitates cooling of the plates, thereby maintaining the operating temperature of the plates relatively low.

The improved distribution of air` obtainable with the tuyre plates of my invention insures a more `uniform rebed. The elongated slots I9 and apertures 2l tend to maintain a balanced air pressure under the i'lrebed. As indicated in Fig. l, the slots Ii] in a lower tuyre plate of an assembly are disposed substantially in coincidence with a number vof the apertures ZI in the next upper plate so that air pockets are prevented from accumulating and causing overheating. Complete circulation of air behind and substantially parallel to the exposed portions of the tuyre p lates is thus, assured, as well as more positive distribution/aty equalpressure of `air fed from the tuyre plate. VIn addition, in case the air passages between the ribs I9 become plugged, air

7f3. is permitted to be forced up between the tuyre plates to maintain the plates relatively cool. The advantages of the elongated slots I are that should one end of the slots become plugged, the other end ordinarily tends to remain open and enables the plugged portion to be blown open 0r blown free of any packed or accumulated matter.

The fact that the width of the channels between the ribs I9 is never less than twice the thickness of the adjacent rib I9 insures a wide aperture beneath the plate which tends to act in a self-cleaning manner in case it does become clogged. The recirculation of cooling air currents maybe maintained through the passages I3, Ill, 2 and 2| insuring the maintenance of safe temperatures under operating conditions of the tuyre plates. The fact that blasts of air are directed immediately adjacent the lower surface of the peripheral portion I8 of the tuyre plate increases the protection afforded to the material of the tuyre plate against the action of excessive temperatures.

While I have described the tuyre plate of my invention in that form which has proven very practical and successful in actual use, I am fully aware that modications may be made in the construction and arrangement of parts in the tuyre plate of my invention. Accordingly, I intend no limitations upon my invention except as may be imposed by the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States is as follows:

l. A tuyre plate comprising a plate member having, in its operative position, a substantially flat top portion and a downwardly inclined curved peripheral portion, a multiplicity of air directing members relatively angularly disposed immediately beneath the inclined portion of said plate for directing air in a substantially fan-like zone beneath said plate in approximately rectangular shaped channels, and side walls for supporting said plate, said plate having passages extending therethrough normal to the flat portion thereof and between said air directing members, and the flat portion of said plate having a pair of arcuate shaped passages therethrough.

2. A tuyre plate comprising a casting having, in its operative position, a pair of depending side portions and a relatively at top portion termi nating in a curved portion, a downward inclined portion extending from said curved portion and terminating in a curved edge formed on a different center, a plurality of relatively angularly disposed air directing members disposed beneath said flat top portion and said inclined portion and dening approximately rectangular channels for air beneath said plate having a transverse width not less than twice the lateral thickness Vof said air directing members, said top portion having passages for air extending therethrough normal thereto and between said air directing members and a pair of segmental shaped passages therethrough.

3. A tuyre plate comprising a plate member having, in its operative position, a substantially nat top portion and a downward inclined curved peripheral portion, a multiplicity of air directing Vmembers relatively angularly disposed immediately beneath the inclined portion of said plate for directing air in a substantially fan-like Zone beneath said plate in approximately rectangular shaped channels, and side walls for supporting said plate, said plate having passages extending therethrough normal to the at portion thereof and between said air directing members, and the flat portion of said plate having an elongated passage for air extending therethrough on one side of the central longitudinal axis thereof intermediate the respective side wall and said axis and adjacent the inner ends of a predetermined number of said air directing members.

4. A tuyre plate comprising a casting having, in its operative position, a pair of depending side portions and a relatively at top portion terminating in a curved portion, a downward inclined portion extending from said curved portion and terminating in a curved edge formed on a dilerent center, a plurality of relatively angularly disposed air directing members disposed beneath said flat top portion and said inclined portion and defining approximately rectangular channels for air beneath said plate having a transverse width not less than twice the lateral thickness of said air directing members, said top portion having passages for air extending therethrough normal thereto and between said air directing members, and elongated passages for air extending therethrough adjacent the inner ends of the relatively angularly disposed air directing members.

5. A tuyre plate comprising a plate member having, in its operative position, a substantially flat top portion and a downward inclined curved peripheral portion, a multiplicity of air directing members relatively angularly disposed immediately beneath the inclined portion of said plate for directing air in a substantially fan-like zone beneath said plate in approximately rectangular shaped channels, and side walls for supporting said plate, said plate having passages extending therethrough normal to the flat portion thereof and between said air directing members, and the flat portion of said plate having elongated passages for air extending therethrough and disposed on opposite sides of the longitudinal central axis of said plate and extending adjacent the inner ends of the air directing members.

6. A tuyre plate comprising a casting having, in its operative position, a pair of depending side portions and a relatively flat top portion terminating in a curved portion, a downward inclined portion extending from said curved portion and terminating in a curved edge formed on a different center, a plurality of relatively angularly disposed air directing members disposed beneath said flat top portion and said inclined portion and defining approximately rectangular channels for air beneath said plate having a transverse width not less than twice the lateral thickness of said air directing members, said top portion having passages for air extending therethrough normal thereto and between said air directing members and having elongated passages for air extending therethrough and disposed on opposite sides of the longitudinal central axis of said plate, and extending from positions adjacent the respective depending side portions to positions adjacent the central axis of said plate at the inner ends of the air directing members.

7. In combination, at least two tuyre plates each comprising a casting, having in operative position, a flat top portion and an inclined lip portion extending from said top portion and terminating in a curved edge, s-aid lip portion having the under surface thereof inclined parallel to the upper surface thereof, a plurality of relatively angularly disposed ribs beneath the casting for directing air outwardly under the inclined lip portion; said plates being arranged in superimposed, longitudinally relatively displaced position, and the lower one of said plates being apertured in the at top portion thereof between adjacent ribs and beneath the inclined lip portion of the upper one of said plates.

8. In combination, at least two tuyre plates each comprising a casting, having in operative position a flat top portion and an inclined lip portion extending from said top portion and terminating in a curved edge, said lip portion having the under surface thereof inclined parallel to the upper surface thereof, a plurality of relatively angularly disposed ribs beneath the casting for directing air outwardly under the inclined lip portion; said plates being arranged in superimposed, longitudinally relatively displaced position, and having apertures in the iiat top portions thereof between adjacent ribs, the apertures in the lower one of said plates being disposed beneath the inclined lip portion of the upper one of said plates, and the lower one of said plates having elongated apertures on either side of the longitudinal central axis thereof substantially in alignment with a number of the aforesaid apertures in the upper one of said plates.

WILLIAM A. RIDDELL. 

